Population statistics of intermediate-mass black holes in dwarf galaxies using the newhorizon simulation
Population statistics of intermediate-mass black holes in dwarf galaxies using the newhorizon simulation
复制标题
使用新地平线模拟对矮星系中的中等质量黑洞进行统计
DOI：
10.1093/mnras/stad1544
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发表时间：
2023
影响因子：
4.8
通讯作者：
Beckmann R
中科院分区：
文献类型：
--
作者：
Beckmann R
虽然超大质量黑洞（SMBH）与它们的宿主星系共同进化是公认的，但目前尚不清楚低质量黑洞，即所谓的中等质量黑洞（IMBH）如何在它们的矮星系宿主中进化。在本文中，我们提出了一个大样本的IMBH的演化的结果，从新的电离变焦体积，它有一个半径为10的共动。我们发现，在矮星系中的IMBHs的职业分数至少有50%的星系与恒星质量下降到，但BH的增长是非常有限的矮星系。在newhorizon，IMBHs的增长在高红移= 3时更有效，但一般来说，IMBHs不会显着增长，直到它们的宿主星系离开矮星系。结果表明，新理论低估了活动星系核的光度函数和活动星系核的组分。我们表明，IMBHs的困难，以保持连接到他们的宿主星系的中心起着重要的作用，限制其质量增长，这种动态的演变远离星系中心变得更强，在较低的红移。
While it is well established that supermassive black holes (SMBHs) coevolve with their host galaxy, it is currently less clear how lower-mass black holes, so-called intermediate-mass black holes (IMBHs), evolve within their dwarf galaxy hosts. In this paper, we present results on the evolution of a large sample of IMBHs from thenewhorizonzoom volume, which has a radius of 10 comoving. We show that occupation fractions of IMBHs in dwarf galaxies are at least 50 per cent for galaxies with stellar masses down to, but BH growth is very limited in dwarf galaxies. Innewhorizon, IMBHs growth is somewhat more efficient at high redshiftz= 3 but in general, IMBHs do not grow significantly until their host galaxy leaves the dwarf regime. As a result,newhorizonunderpredicts observed AGN luminosity function and AGN fractions. We show that the difficulties of IMBHs to remain attached to the centres of their host galaxies plays an important role in limiting their mass growth, and that this dynamic evolution away from galactic centres becomes stronger at lower redshift.